Hmmmm, Square Enix seems like the most natural choice. Get FF as a permanent exclusive franchise. It doesn't really add anything new though. Capcom would be great, but a ton of their revenue comes from Switch and PC these days, so Sony would need to pay a lot for them only to lose a ton of the revenue when making all of the content exclusive. Rockstar would be huge, but it would be for the future as I don't see them trying to make any of the already released games exclusive. GTA6 as an exclusive would be out of this world, but the cost would be very high. Sega doesn't seem to fit them at all, all their games already come to Playstation, except all the PC games. Sega makes so much revenue from PC right now, and so many of their games are PC first. Bandai Namco isn't mentioned here, but seems like a better fit than most of these. I think they also do a ton of Anime games, and since Sony is big in that market it seems like a natural fit.